TG 72-306B Remote Control Wireless Doorbell Wireless Design,Range is Approximately 300 feet (in open air),Easy Installation,Ringer includes Adhesive back for Easy Mounting Choose from 36 different Chimes Indicator Light on Receiver Chime measures 1.25 x 2.5 x 3.5-Inch,Ringer measures .875 x 1.75 x 3.125-Inch,Transmitter Battery Lasts up to 1 Year (Up to 20 Presses per Day) Transmitter requires one 12 volt battery (included) and Chime requires 2 "AA" batteries (not included)